Due Feb 24, 2:59 AM EST
Consider the set A={1,3,2,0,1,3}. Find ∣A∣.
This is correct! Indeed, the repetitions in the list of elements does not matter, we need only to count the number of distinct elements in the list.
Consider the set A={1,3,4,7,10,11}. Which of the following sets B are subsets of A?
Correct! All elements of B belong to A.
Correct! There are no elements in B, so indeed every element of B is contained in A.
Correct! All elements of B belong to A.
Consider the sets A={1,2,4,5,6} and B={1,2,3,5,7}. What is the intersection A∩B of sets A and B?
This is correct! Intersection is the set of all elements that belong both to A and B.
Consider the sets A={1,2,4,5,7} and B={1,2,3,5,6}. What is the union A∪B of sets A and B?
This is correct! Union is the set of all elements that belong to at least one of the sets A and B.